Malicious PDF — malware analysis report

Static analysis result for SHA-256 8039e97fe0d7eadc…

MALICIOUS

PDF

88.3 KB Created: 2021-07-16 05:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dca48ef6f47a7d75b5488ac463934319 SHA-1: 1139b148574111a93af9ec2fad4042d8acbdb022 SHA-256: 8039e97fe0d7eadcd772b6f1f6940a39f7e0000b29bb26cbf2c77548c8a0e621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://unsersohn.ch/images/file/78066949159.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/avf1fu9j0p0omru1a6bd72ar65/60630051109.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/mavijirenapadusejuwiz.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/11896121172.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/4h87s8vc35m5lnaqjts9bnqrjn/sabep.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/306d6ac175de9746369c837c0fa0c001/24343735032.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/78724476370.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608844607a481---puvinirubaxasixujukasun.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c304fbfae1785d10664897737338385d/sewalusageluva.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/67440676188.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b8c65eef---17711356256.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/6885e9dce1c8858fb614c48d7bca3da9/14344942335.pdfIn PDF document text
    • http://charivne.info/images/file/26950305601.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/lepojukoraxe.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a9eb6b62f221e4a55c188379366cdf14/67968692744.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/4642498659.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607511613d23a---85457714840.pdfIn PDF document text
    • https://discoverthesky.it/file/18826469078.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/50144557838.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a761a223321---28468744988.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/69272365088.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/4691433d29bc2307890e16040df4cb75/relutekarurapovamadokejof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=substring+in+javascript+with+delimiterPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 21232 bytes
SHA-256: d8c8cc70c73a5a346ceea319fde1ad54db13ab8b39b967484b2928e966bb0f9c
font_01_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 11440 bytes
SHA-256: c423f899a6c253189d83d3aaff6a69f2d06e86a0a345928561af644fcad25664

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